title: Kondo versus magnetic coupling of cobalt dimers in a Cu-O (2 × 1) reconstruction.
abstract: Co atoms and dimers embedded in a Cu(110)(2 × 1)-O surface oxide are investigated via low-temperature STM/STS experiments and first-principles simulations. It is found that Co dimers incorporated into adjacent rows of the Cu(110)(2 × 1)-O reconstruction show Kondo resonances decoupled from each other, whereas they are antiferromagnetically coupled (and do not exhibit a Kondo effect) when they are aligned on the same row. This shows that it is possible to decouple single carriers of the Kondo effect via a proper choice of the adsorption and host geometry. It is also shown that an oxidic environment presents features remarkably different from those of pure metal substrates.
authors.affiliation: Institute of Physics, Surface and Interface Physics, Karl-Franzens University Graz, A-8010 Graz, Austria.
authors.forename: Andreas
authors.initials: A
authors.lastname: Gumbsch
authors.forename: Giovanni
authors.initials: G
authors.lastname: Barcaro
authors.forename: Mike G
authors.initials: MG
authors.lastname: Ramsey
authors.forename: Svetlozar
authors.initials: S
authors.lastname: Surnev
authors.forename: Alessandro
authors.initials: A
authors.lastname: Fortunelli
authors.forename: Falko P
authors.initials: FP
authors.lastname: Netzer